Experimental setup: (a) an overview of the laboratory scale EAF and (b) the Al2O3 crucible in a graphite block holder and positioning of the optical cable.
Photographs of the furnace in use. (a) A neutral density filtered photograph of the arc melting Ni sample and (b) the furnace right after shut-down (no filter).
Example of the background removal procedure applied to an experimental spectrum of MgO. The fitted background curve is indicated by the dashed line, with the fit procedure optimized blackbody temperature of about 3230 °C. The upper spectrum is the result of the background subtraction.
Optical emission spectra of iron group elements. For visual comparison Cr2O3 is presented in addition with Cr. C2 Swan bands are present in Fe spectrum. Numbered labels refer to lines in Table I . Intensities of the spectra are arbitrary units.
Spectra of some of the oxides commonly found in slag. The spectrum of the pure arc between electrodes is indicated by Ar. In CaO spectrum there is a fully self-reversed Ca I emission line, the position of the line is marked with letter a. In MgO spectrum there is a self-absorbed Mg I emission line which is marked with letter b. Numbered labels refer to lines in Table I . Intensities of the spectra are arbitrary units.
Comparison of the experimental spectrum of Fe to spectra of neutral and singly ionized Fe spectra constructed from the NIST data. 14 See text for details.
Zoomed part of the experimental Al2O3 spectrum showing emission structures from AlO molecule.
A sum spectrum composed of individual experimental spectra scaled to emulate the composition of slag. Selected marker lines for each elemental substance are indicated by the numbers. See Table I .
An experimental spectrum of equal mixture of Fe and Cr with spectra of Fe and Cr separately. See Table I and text for explanations.
Selected lines for chemical analysis for the combination spectrum of studied substances.
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